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UC1851

UNITRODE
Part Number UC1851
Manufacturer UNITRODE
Description PWM Controller
Published Apr 21, 2020
Detailed Description Programmable, Off-Line, PWM Controller UC1851 UC2851 UC3851 FEATURES • All Control, Driving, Monitoring, and Protectio...
Datasheet PDF File UC1851 PDF File

UC1851
UC1851

Overview
Programmable, Off-Line, PWM Controller UC1851 UC2851 UC3851 FEATURES • All Control, Driving, Monitoring, and Protection Functions Included • Low-Current Off Line Start Circuit • Voltage Feed Forward or Current Mode Control • High Current Totem Pole Output • 50% Absolute Max Duty Cycle • PWM Latch for Single Pulse Per Period • Pulse-by-Pulse Current Limiting plus Shutdown for Over-Current Fault • No Start-Up or Shutdown Transients • Slow Turn-On Both Initially and After Fault Shutdown • Shutdown Upon Over or Under Voltage Sensing • Latch Off or Continuous Retry After Fault • 1% Reference Accuracy • 500kHz Operation • 18 Pin DIL or 20 Pin PLCC Package BLOCK DIAGRAM DESCRIPTION The UC1851 family of PWM controllers are optimized for offline primary side control.
These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting.
In all other respects this line of controllers is pin for pin compatible with the UC1841 series.
Inclusion...


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